Classic watches, watchmaking, antique tools, history, vintage ephemera and more!

Learn about mechanical timepieces and how they work, the history of the American watch industry and especially all about the Elgin National Watch Company! Check back for new content daily.

Although this is technically a blog, the content is not generally in a time-based sequence. You can find interesting items throughout. Down the page some is an alphabetical word cloud of keywords used here. A great way to dig in is to look through those topics and click anything you find interesting. You'll see all the relevant content.

Here are a few of my favorites!

There are some large images on some posts, so that might impact your load times, bit I think you will find it worth the wait. Thanks for visiting!

The Waltham Taper Shoulder Detachable Balance Staff

From American Horologist magazine, December 1938

The Waltham Taper Shoulder Detachable Balance Staff

In driving out the old staff, care should be taken to see that the hub in the balance arm has a secure seating in the taper mouth of the stump-the balance arm must not touch the stump; the hub should never be loosened in the arm.

Notwithstanding the accuracy with which the staffs are made, it will be found sometimes that the staff is too tight a fit for the hole in the hub. In such cases, the staff should be reduced with oilstone powder and a strip of soft steel, used by hand, while the staff is revolved in the lathe; or a pivot polisher lap may be used. The hand method is generally satisfactory, for the reduction required is but slight.

In driving in the staffs, care should be taken to seat the taper shoulder firmly; this requires a special punch, with outer diameter slightly less than the taper shoulder of the staff. If the young watchmaker will bear in mind the points we have mentioned, he should have no difficulty. 
K. and D.

Post a Comment

Click "Older Posts" just above for more, or use the archive links right here.

Blog Archive